Messages in this thread | | | Date | Wed, 20 Aug 2008 08:26:19 +0200 | From | "Vegard Nossum" <> | Subject | Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0() |
| |
On Wed, Aug 20, 2008 at 3:39 AM, Andi Kleen <andi@firstfloor.org> wrote: > On Tue, Aug 19, 2008 at 09:51:44PM +0200, Vegard Nossum wrote: >> Hi, >> >> With latest -git (1fca25427482387689fa27594c992a961d98768f), I got >> this on reading from /dev/cpu/*/* while hot-unplugging cpu1. > > It's generally known the oprofile doesn't support CPU hotplug well. > Someone needs to make a project out of fixing it properly. Right now > it's just a "don't do that when it hurts"
Hm. What you say is true, but this one in particular has nothing to do with oprofile! It has something to do with reading /dev/cpu/*/msr while hot-unplugging cpu1:
[<c011733e>] msr_read+0x6e/0xa0 [<c01a87b4>] vfs_read+0x94/0x130
I wasn't using oprofile when this happened. So I think it should also be considered a separate issue. Though yes -- CPU hotplug in general tends to break a lot of things.
Vegard
-- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036
| |